•Large windows and
large number of streams can cause last stream to take a long time to close.
•Linux memory leak
•Linux TCP configuration caching
•What is the window size actually used/reported
•32 bit counters in iperf and routers wrap, need latest
releases with 64bit counters
•Effects of txqueuelen (number of packets queued for
NIC)
•Routers do not pass jumbos
•Performance differs between drivers and NICs from different
manufacturers
–May require tuning a lot of parameters